// map-merge 合并map
$light-weights: ("lightest": 100, "light": 300);
$heavy-weights: ("medium": 500, "bold": 700);
@debug map-merge($light-weights, $heavy-weights);
//  ("lightest": 100, "light": 300, "medium": 500, "bold": 700)





$social-colors: (
    dribble: red,
    facebook: blue,
);

$social-colors1: (
    google1: yellow,
    twitter1: pink
);
$map:map-merge($social-colors, $social-colors1);

@each $name in map-keys($map) {
    .btn-#{$name} {
        color: $name;
    }
}